Finite element simulation of the large elastoplastic deformation of multicrystals
Cristian Teodosiu, Jean Raphanel, Laurent Tabourot
Abstract
A three-dimensional finite element model of the large elastoplastic deformation of crystalline aggregates has been developped in order to analyse and predict the heterogeneity of the deformation of crystalline aggregates. The elastic anisotropy and the micromechanics of the plastic slip are taken into account. The model has been applied to multicrystals, i.e. to polycrystals made of a single layer of grains whose grain boundaries are orthogonal to a common plane. Each grain is divided into finite elements, and the model enforces the continuity of the displacements and the equilibrium of the stress vectors across the grain boundaries. The model predicts the evolution of the strain and stress fields, of the lattice orientation and of the dislocation densities on all active and latent glide systems.